While working as gym teachers at an all-girls finishing school, Scooby-Doo, Shaggy and Scrappy-Doo get tangled up in a monstrous mystery.While working as gym teachers at an all-girls finishing school, Scooby-Doo, Shaggy and Scrappy-Doo get tangled up in a monstrous mystery.While working as gym teachers at an all-girls finishing school, Scooby-Doo, Shaggy and Scrappy-Doo get tangled up in a monstrous mystery.